/*
 * Copyright 2015 Victor Albertos
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.rx_cache;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Set of migrations to be performed in order to guaranty data integrity between releases if data
 * model changes has been performed.
 *
 * 计划数据迁移，可改变数据类型，如int型转换为long型
 * 每次清理完需要数据迁移的缓存时,会将version值最大的@Migration的version值保存到本地{@link Migration}.
 *
 * @SchemeMigration({
 *             @Migration(version = 1, evictClasses = {Mock.class}),
 *             @Migration(version = 3, evictClasses = {Mock3.class}),
 *             @Migration(version = 2, evictClasses = {Mock2.class})
 *     })
 * interface Providers {}
 *
 * @see MigrationCache
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface SchemeMigration {
  Migration[] value();
}
